I grabbed this when Krakauer posted the free PDF on the magical world wide web. (Seriously, have you guys of it? Wonderful.)
Three Cups of Deceit is about Greg Mortenson, author of Three Cups of Tea and Stones into Schools. In his books, Mortenson talks of a program he started in Pakistan to build schoolhouses. Krakauer details lie after lie from Mortenson: how Mortenson uses money from the foundation to purchase his books so they will stay on the bestseller lists, how many of the schools don't actually exist, how Mortenson's story of being held by the Taliban is baloney.
This book upset me because I felt hoodwinked by Mortenson. I read Three Cups of Tea a couple years ago and enjoyed and felt inspired by it. Though, Three Cups of Tea is terribly written.
If you've read Mortenson's books, you really need to pick this up. I think you'll be shocked by everything Mortenson has done. If you haven't read Three Cups of Tea, I think Krakauer does a good job of explaining things that it'd still be worth your while to pick Three Cups of Deceit up. It's really short, about 75 pages, so it's a quick read.